In 1905, Henry W. Clark authored "A Genealogy Of The Clark Family". Through the years this book has been a treasured source of information for family researchers.

From "A Genealogy Of The Clark Family", by Henry William Clark, 1905:

Henry William Clark was born in Laurens District, South Carolina, May 22, 1825. The family moved to the state of Georgia when he was but a child in 1829. There he grew up on the farm, assisting at farm labor and receiving ordinary common school education. He was trained to habits of industry and frugality, and this training was of much value to him in after life. He professed religion when about fifteen years old and joined Bethlehem Baptist Church, a Missionary Baptist organization in the vicinity of the parental homestead. In after years and while residing in Montgomery County, Alabama, he was for many years clerk of the church of his membership, and was liberal with his means in support of the church and village school.
In the fall of 1847 Henry W. Clark settled in Chambers County, Alabama and began a mercantile business in co-partnership with his brother-in-law Benjamin J. Flowers, under the style and firm name of Flowers & Clark. This co-partnership was dissolved in the winter of 1851-52.
In the spring of 1853, he and his little family, wife and two children, moved and settled at Pinelevel, Montgomery County, Alabama, where he again engaged in merchandising and in the course of a few years built up a fine business, and was in the midst of a prosperous trade when the Civil War began in 1861. He had established a good credit in New York, could buy all the goods he could handle and had promise of a very successful career as a merchant. The war dissipated all that.
Because of physical disabilities he was not in the Confederate Army, though he had no less than 17 brothers and brothers-in-law in that memorable conflict.
In 1862 he closed out his mercantile business and was actively engaged at milling, tanning, etc., until the close of the war. During the war he invested some money in lands and not a little in cotton, and these investments proved to be very profitable, especially the latter, and when the war closed he was able to make satisfactory settlement of a large indebtedness in New York and elsewhere and have an ample competency left with which to begin life anew in the new-born, though prostrate South; new in the new order of things, prostrate financially, and politically under the heel of the carpetbagger, the scalawag and the negro.
In the month of May, 1870, Mr. Clark moved to the city of Montgomery, and in the fall of that year took possession of a purchase he had made, property bounded by Houston, Hilliard, Pelham and Garrison Streets, for which he paid $10,000. Here he resided for 29 years and reared his large family of seven sons and one daughter.
For some years after settling in Montgomery he was engaged in the business of life insurance, being the general agent and manager of the Southern Life Insurance Company for Alabama. In 1876 he engaged in the manufacture and sale of yellow pine lumber, and was thus employed about 12 years. In 1881 he was attacked with bronchitis from which he has never recovered and much of his time and means have been devoted to the care of his health. For ten or more years he has entirely retired from active business pursuits.
In politics he has been a life long Democrat, but never an aspirant for political office. Never being active in political work; never a slave to party lash. Never voted else than a Democratic ticket, but had the courage of his convictions and refused to vote for W. J. Bryan as the nominee of the party for President of U.S. in 1896, because he did not approve of the financial policy of the candidate.
Masonic history. – As Master Mason. Received the degrees in Fredonia Lodge No. 79, Fredonia, Chambers County, Alabama.
Initiated as Entered Apprentice July 12, 1850. Passed to the degree of Fellow Craft, August 9, 1850. Raised to the sublime degree of Master Mason, August 27, 1850. Was demitted in 1853. Petitioned with others, for Pinelevel Lodge No. 202, Pinelevel, Alabama in October, 1853; was a charter member December 8, 1854. Was appointed Master in the organization of the Lodge, and elected and served as W.M. the following years: 1856-1858, 1860, 1864-65, 1868-69. Affiliated with Andrew Jackson Lodge No. 173, Montgomery, Alabama in 1902.
As Royal Arch Mason. – Received the degrees in Pinelevel Royal Arch Chapter No. 75, September 1, 1864. Served as Secretary 1864 to 1866; was elected and served as High Priest 1866-67, was elected and served as King in 1869. Received the Order of High Priesthood in 1869.
As Knight Templar. – Montgomery Commandery No. 4, Motgomery, Alabama. Was received, constituted and created a Kinght of the Illustrious order of Knight of the Red Cross, December 11, 1868. Was introduced, created and dubbed a Knight Templar and Knight of Malta or order of Holy St. John of Jerusalem, December 12, 1868, Sir Peleg Brown, R.E. Grand Commander, presiding.
H. W. Clark having been a member of Montgomery Commandery, No. 4, Knights Templar, in good order and regular standing, for 30 years, becomes a life member exempt from all dues and assessments.
H. W. Clark's wife, Mary Susan, daughter of David Wright, a well-to-do farmer, was born in Newton County, Georgia, December 6, 1828. They were married at the residence of her parents in Chambers County, Alabama, September 19, 1848; her uncle Elder Benajah Goss officiating. She received her education in the common schools and was trained to habits of industry and economy by her mother, who was a good farmer's wife. She was a young woman of attractive personality with a happy faculty for entertaining her friends. She made a frugal and industrious housekeeper, and although only 21 years old when married, she had made more than ordinary preparation for housekeeping. She was of a sympathetic nature, pitied the poor and afflicted and was ever ready to render them aid and comfort. She was always solicitous for the welfare and happiness of her children; was a consistent member of the Baptist Church, which she joined in early life, and had an abiding faith in the promises of the gospel, seeming never to doubt her final salvation. She blessed the life of her husband as only a true and loving wife could do. She died at the family residence, Houston Street, Montgomery, Alabama, September 12, 1893 and her remains were interred in the family lot in the city cemetery.
The children of Henry W. and Mary S. Clark were ten sons and one daughter:

1. Courtney James Clark 1849-1850
2. Mary Judson Clark 1851, married Arthur S. Stewart
3. John Austin Clark 1852, married Rebecca Wilson
4. William Henry Clark 1856, married Josie Gardner
5. Thomas Harvey Clark 1857, married Carrie Marks
6. Julius Brown Clark 1861, married Julia A. Barker
7. Henry William Clark, Jr. 1863, married Kiturah D. Elam
8. Harvey Tucker Clark died in infancy
9. Charles Rufus Clark 1865, married Menla J. Swann
10. James Davis Clark 1867, married Martha E. Moody
11. Robert Lee Clark 1871-1872
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1850 Chambers County, (Dist. 19 1/2) AL Census:

#H445

Henry W. Clark 25M Merchant R$600 Born GA
Mary Clark 22F Born GA
James Clark 11/12M Born AL

Note: Chambers County, AL Marriage Record Book 4 Page 79 - Henry W. Clark and Mary S. Wright on September 19, 1849, by Benajah Goss, MG. William Clark, 2nd Bondsman.
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1860 Montgomery County, (Dist. 2) AL Census:

#H730

H. W. Clark 35M Merchant R$7,000 P$13,000 Born SC
Mary S. Clark 33F Born GA
Mary J. Clark 10F Born AL
John A. Clark 8M Born AL
Wm. H. Clark 6M Born AL
Thos. H. Clark 4M Born AL
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1880 Montgomery County, AL Census:

#H667

Henry W. Clark 55M Lumber Dealer Born SC
Mary S. Clark 53F Wife Born GA
Thomas H. Clark 21M Son Lawyer Born AL
Julius B. Clark 18M Son At School Born AL
Henry Clark 15M Son At School Born AL
Charles Clark 12M Son At School Born AL
James Clark 9M Son At School Born AL
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1900 Montgomery County, (Montgomery-Columbus St.) AL Census:

#H222

Mary J. Stuart 46F (no occupation listed) Born March 1854 in GA(?) (Widow. Mother of 4 children; 4 children living)
Alpheus Stuart 27M Son (no occupation listed) Born July 1872 in AL
Mary E. Stuart 25F Daughter Born Jan. 1875 in AL
William L. Stuart 23M Son Sanitary Inspector Born May 1877 in AL
Clifford W. Stuart 21M Son Clerk-Oil Works Born Feb. 1879 in AL
HENRY W. CLARK 75M Father Born May 1825 in GA(?)