No. 1, July, l'.)_o| PHYSIOLOGY 211 



1400. BBZSBONOF, N. Uber das Wachstum der Asperglllaceen und anderer Pilze auf stark 

 zuckerhaltigen Nahrboden. [Development of Aspergillaceae and other fungi on media con- 

 taining a high percentage of sugar.) Ber. Deu1 ch. Bot. Oes. 3d: 646-648. 1918 Uv$ 



i , which was qo1 known to reproduce Bexually, produces perithecia when grown on gi 

 tin containing 12 per cent sugar and incubated a1 I ' '. /.'■■'< top LgOna4 



per cent sugar solution produces zygotes abundantly. Decrease in temperature apparently 



favors sexual reproducl ion, which may he 1 he result of t he lower oxidat ion i 108 I 



temperature. — Ernst Artachwager. 



1401. ClTRON, II. Ueber eln neues Verfahren zur Herstellun^ von Kollorllumsa'ckchen. 

 [A method of preparing collodion tubes.] Zeitschr. [mmunit&tsforsch, 27: • >. 1918. — 

 A gelatin capsule of the proper size is coated with collodion on theoutsidi Iry, 



the gelatin hydrolyzed by any enzyme preparation or gelatin-liquefying orga:. 

 oughly washed, after which it is ready for use. — ('. IT. Dodge. 



1402. Coupix, Heniu. Sur le pouvoir absorbant du sommet des raclnes. [Absorption 

 by the tip of the root.] Compt. Rend. Acad. Sci. Paris 168:519 522. 1919.— Two seedli] 

 each of pea, Castor bean, bean, and pumpkin, with the plumules scarcely visible and roots of 

 3 cm. length, were suspended in the same flask in such a way that one of the seedlings did not 

 touch the water in the bottom, while the tip of the root of the other penetrated the water for 

 2 to 3 mm. The mouth of the flask was plugged with cotton and the cultures placed in 

 dark at 24°C. At the end of 24 hours the length of root and plumule was recorded and the 

 seedlings so adjusted that only the tips of the roots touched the water. Observations were 

 continued 6 days. In all cases where the tip of the root was immersed in water there was a 

 marked elongation of both plumule and root, and a strong production of lateral roots. Root 

 elongation in the case of pea and bean amounted to 5 to 7 cm., and to 15 cm. in pumpkin. 

 In the seedlings which were merely suspended in the humid air elongation was scarcely per- 

 ceptible, the plants beginning to dry out at the end of the fourth day. The root is able to 

 absorb water at the very tip in quantities sufficient to permit the maximum development of 

 the seedlings. — F. B. Warm. 



'6' 



1403. Crocker, William. Aeration systems of leaves. [Rev. of: Neger, F. W. Die 

 Wegsamkeit der Laubbiatter fur Gaze. Flora 11-12: 152-161. 1918 (See Bot. Absts. 2, En- 

 try 619).] Bot. Gaz. 67:517-518. 1919. 



1404. Crocker, William. Permeability. [Rev. of: Paine, S. G., axd L. M. Saunders. 

 On a peculiarity exhibited by the testa of wrinkled peas. Ann. Botany 32: 175. 1918.] Bot. 

 Gaz. 67:279. 1919. 



1405. Crocker, William. Turgor and osmotic pressure. [Rev. of: Tuoday, D. On 

 turgescsnee and the absorption of water by the cells of plants. New Phytol. 17: 103-113. 

 1918. (See Bot. Absts. 1, Entry 686).] Bot. Gaz. 68: 72. 1919.— "This article ought to do 

 much to clear up the confusion in this field." 



1406. Flood, Margaret G. Exudation of water by Colocasia antiquorum. Notes Bot. 

 School Trinity Coll. 3 : 59-65. 2 pi. 1919.— The extreme purity of the water exuded from the 

 leaf tips of Colocasia antiquorum appeared to be strong evidence in favor of regarding I he water 

 as either raised or exuded by a special gland or as raised osmotieally and subsequently puri- 

 fied by glandular action. Observations and experiments indicate, however, that there is no 

 special tissue in the leaf-tip which might be described either as a gland or epithem for th< 



tion. Neither is there any membrane intervening between the water-c h a nn el s and the 

 depression in the leaf for filtering the water. It seems that cells lower down must be respon- 

 sible for the filtration of the water. There seems to be no evidence for the existence of special 

 cells for this function outside of the root. — G. B. Rigg. 



1407. Haynes, Dorothy. Electrical conductivity as a measure of electrolytes of vegetable 

 saps. Bioehem. Jour. 13:111-123. 1919. — A study is made of the influence of non-electro- 



