440 BIBLIOOBAPHT. 



hj pressure, tlie author obtained a sap differing from that formed 

 ia the wood and liber in the presence of phosphorus (phosphate 

 of magnesia). Comparative examinations of the three saps are 

 given. Phosphoric acid was found only in combination with 

 magnesia. 



4. Summer Evaporation. With table of estimated proportion 

 of evaporation per square foot of leaf surface in nine species. This 

 projDortion was found to vary in different species iadependently of 

 the number of leaves and extent of their surface. 



5. Evaporation from the Pine in winter. Excepting during a 

 period of frost (in the winter 1859-60), the amount of loss from 

 evaporation was such that it could only be sustained by the ab- 

 sorption and ascent of fresh sap. The daily maximum of evapo- 

 ration through the warmer season, from a fir 3 feet high, was ^Ib., 

 the minimum, y'-olb. 



6. The Economy of Evaporation. In the beginning of March, 

 branches of two adjoining Weymouth Pines, the trunk of one of 

 which had been 'ringed' some four years previously, were intro- 

 duced into sej)arate glass globes. The evaporation from the im- 

 injured tree was sufficient to cover the surface of the glass with 

 moisture in the coui'se of half an hour, while, after an exposure 

 of three days, no trace was deposited in the other. 



7. On the difference in the soluble contents of the sap in the 

 root and upper jjart of the tree. 



8. Experiments on the absorption (aufsaugung) of coloured 

 fluids by wounded sm'ftices. The result of several experiments is 

 detailed. Water or tree-sap was found to be absorbed less rapidly 

 than poisonous solutions. 



Herbich, Eb. — Ueber die Verbreitung der in Galizien und der 

 Bukowina wildwachsenden Pflanzen. Wien Verhandl. xi. 33. 



Bemerkungen liber den bei Kj-akau wildwachsenden Saro- 



thamnus vulgaris. Wien Verhandl. xi. 399. 



HoELZL, K. — Botanische Beitrage aus Galizien. Wien Verhandl. 

 xi. 433. 



On the botanical observations made by Hacquet on his Car- 

 pathian journey. 



HoFFMANF, Herjiajstn. — ZuT Konntniss der Vegetations-normalen. 

 Bot. Zeit. 18G1. pp. 177, 185. 



HoFMEisTER, W. — IJeber durch die Schwerkraft bestimmten Eich- 

 tungen von Pfianzentheilen. Pringsh. Jahrb. iii. 77. 



Neue Beitrage zur Kenntniss der Embryobildung der Pha- 



nerogamen. II. Monocotyledonen. Abh. K. Sachs. Gres. Wiss. vii. 

 (1861). 631. 



The author points out the remarkable general analogy obtain- 

 ing in Monocotyledons in the mode of develojjment of the sexual 

 organs. The embryogeny, &c. of numerous species belonging to 

 upwards of twenty Natural Orders is described and illustrated by 

 figures. 



