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book on this subject is entitled How Plants Grow, and was pub- 

 lished' in 1858. It gives a simple introduction to Structural 

 Botany, with a popular flora of common plants, both wild and 

 cultivated, profusely illustrated. Many a botanist of the present 

 day looks back with grateful recollections of the first impulse 

 given to him in his botanical infancy by this book. The other 

 book of this series is How Plants Behave^ published in 1872, 

 being a description in the very simplest language of how plants 

 move, climb, employ insects to work for them, etc. 



In 1868 was published Field, Forest and Garden Botany, 

 being a simple introduction to the common plants of the United 

 States east of the Mississippi River, both wild and cultivated. 

 Those who have used this book know how useful and indispen- 

 sable it is in studying the plants of the garden. Dr. Gray was 

 never satisfied with this work, and hoped to entirely revise it 

 within a few years. In 1848 appeared a work, which, perhaps, 

 more than any other, has been the constant companion of botan- 

 ists of the Northeastern United States, both at home and in the 



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field. To all those interested in a knowledge of our plants, the 

 Manual is a household word. This book was entitled A Manual 

 of the Botany of the Northern United States. It has passed 

 through five editions, the last appearing in 1867. Of this there 

 have been eight issues. The first edition included the region 

 from New England to Wisconsin, and south to Ohio and Penn- 

 sylvania, inclusive. It afterwards embraced all the country east 



In 1846 he published, in the Memoirs of the American Acad- 

 emy, Chloris Borcali- Americana, being illustrations of new, rare 

 or otherwise interesting North American plants, selected chiefly 

 from those brought into cultivation at the Botanic Garden of \ 

 Harvard University, Cambridge. This work was illustrated with 

 ten plates. Only the first decade appeared. In 1848 was pub- 

 lished his Genera America Boreali-Orientalis Ilhistrata, beauti- 

 fully illustrated with figures and analyses from nature by Isaac 

 Sprague, A second volume appeared in 1849. These two vol- 

 umes contained one hundred and eiglity-six plates, but unfortu- 

 nately the work was not continued. 



Dr. Gray's wonderful power of making botany interesting to 

 the young is shown in his Botany for Young People. The first 





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