ON SPONTANEOUS EVAPORATION. J^ 



they can pretend to be the origin of the root. This is far- 

 ther evident from 



Figs. 20 and 21 : the former showing a French bean, with 

 the part to which the radicle grows starting from it : the 

 latter, the same magnified: z, the part on which the cotyle- 

 d . - j-row ; I/, that from which the radicle proceeds; h, /^, 

 tin. ! ;->,Lrs. 



Fi:.'«. -1:2, 23, 24, 25. The chestnut, peach, grass, and 

 bean ; showing the co'.ripletioa of the embryo by its growing 

 in the earth, f, the radicle, u, the seed. 



Fig, 26. The seed of the date palm. 



Fig. 27. The heart greatly magnified, with the leaves, or 

 cotyledons, wrapped round it. 



Fig. 28. The same, with the leaves unfolded, to show- 

 that they are two, and that the point leaf is a primordial 

 leaf. 



Fig. 29. The seed of the little palm. 



Fig. 30. The heart, with its two cotyledons unfolded. 



II. 



On the Ratio the spontaneous Evaporation of Water bears to 

 Heat: by Hon ore Flaugergues*. 



JL HE celebrated academy at Lyons proposed last year as Prize questi* 

 the subject of a prize, " to determine the relation between Proposed, 

 the spontaneous evaporation of water and the state of the 

 air, as shown by the thermometer, barometer, and hygro- 

 meter." This interesting question 1 was tempted to inves- 

 tigate; and accordingly I began a series of experiments as 

 early as the month of September, I8O6, which I have since 

 continued without interruption. The academy was very 

 indulgent to the paper I had the honour of transmitting it 

 on this subject : but the prize it condescended to bestow on 

 me I consider less as a reward, which I was far from merit- 

 ing, than as an excitement to multiply and extend my re- 

 searches. I have therefore continued the inquiry I had 

 begun, so that my work has reached a considerable extent ; 



* Journal de Physique, vol. LXV, p. 446. 

 Vol. XXVII—Sept. 1810. C and 



