430 
POPULAR SCIENCE REVIEW. 
briefly stated : — 1. Total quantity of water in tlie leaves of the bay laurel, 
63 ’4 per cent.* 2. Quantity of water which can be removed from the leaves 
by calcium chloride, 5-08 p. c. 3. Quantity of water which can be removed 
from the leaves by sulphuric acid in vacuo , 6*09 p. c. 4. Quantity of water 
which can be removed from the leaves in the sun, 5-8 p. c. 5. Amount of 
transpirable fluid in stem and leaves, between 6 and 7 p. c. 6. Amount of 
fluid in relation to cell sap, between 56 and 57 p. c. 7. Rapidity of trans- 
piration in sunlight, 1 hour, 363 p. c. 8. Rapidity of transpiration in 
■diffused daylight, 1 hour, 0-59 p. c. 9. Rapidity of transpiration in dark- 
ness, 1 hour, 045 p. c. 10. Amount of transpiration in darkness, 48 hours 
(mean), 13*47 p. c. 11. Amount of fluid transpired in a saturated atmo- 
sphere, in sun, 1 hour, 25*96 p. c. 12. Amount of fluid transpired in a dry 
.atmosphere, in sun, 1 hour, 20*52 p. c. 13. Amount of fluid transpired in a 
saturated atmosphere, in shade, 1 hour, 0*00 p. c. 14. Amount of fluid 
transpired in a dry atmosphere, in shade, 1 hour, 1*69 p. c. 15. Quantity of 
water taken up by leaves when immersed in it, 1| hour (mean), 4*37 p. c. 
16. Quantity of watery vapour absorbed by leaves in a saturated atmosphere, 
18 hours, 0*00 p. c. 17. Amount of fluid transpired by upper surface of 
leaf, in sun, 1 hour, 1*34 p. c. 18. Amount of fluid transpired by under 
surface of leaf, in sun, 1 hour, 12*33 p. c. 19. Amount of fluid transpired, 
both sides coated with collodion, in sun, 1 hour, 0*96 p. c. 20. Amount of 
fluid transpired by upper surface of leaf, 48 hours in diffused light, 2*82 p. c. 
21. Amount of fluid transpired by under surface of leaf, 48 hours in diffused 
light, 16*08 p. c. 22. Amount of fluid transpired, both sides coated with 
•collodion, 48 hours in diffused light, 2*56 p. c. 23. Relation of fluid taken 
up to that transpired, and that retained by plant in 1 hour sunlight — 
G-rammes. 
Total amount taken up ... 1*088 
Deduct . . . 1*038 
Difference . .0*05 
Amount transpired .... 0*64 
Gain of weight of branch . . 0*398 
Total .... 1*038 
24. Increase of weight of branch in saturated atmosphere, diffused daylight, 
48 hours, 7*34 p. c. 25. Increase of weight of branch in ordinary atmo- 
sphere, diffused daylight, 48 hours, 7*14 p. c. 26. Increase of weight of 
branch in ordinary atmosphere, darkness, 48 hours, 3*01 p. c. 27. Rapidity 
of ascent of fluid in plants (a) 8— inches in 70 minutes, in sun. Lithium 
citrate. Transpiration equal to 7*58 p. c. per hour, in sun. Lithium all 
through branch. 28. Rapidity of ascent of fluid (6) 9— inches in 30 
minutes ; Lithium citrate. 29. Rapidity of ascent of fluid (c) 5— inches in 
•30 minutes ; Thallium citrate. 
The Function of Bog Mosses. — Dr. Braithwaite, in an interesting paper on 
mosses in the “ Monthly Microscopical Journal” for July, says that with 
* Percentage calculated on the total weight of leaves or branch employed. 
