71 



only through the cotyledons or the endosperm, radially to the 

 circumference of a disc of cork. The apparatus is set in action 

 by connecting the caoutchouc tube of the cover with the \\ater 

 supply or a water reservoir. By regulating the strength of the 

 stream of water the rate of the waterwheel can be increased or 

 diminished. The splashing of the water furnishes sufficient 

 moisture for the germination of the seeds, so that all the roots 

 are developed centrifugally, whilst the stems grow in a centri- 

 petal direction. The observations can be made through the glass 

 window, which is, however, generally closed by a shutter in 

 order to keep out the light. 



269. Shade, devised by Prof. Sachs, for growing 

 plants under the influence of coloured light. 



Made by Warmbrunn, Quilitz, fy Co., Berlin. 

 E. 173. 1877. 



The apparatus consists of two glass shades placed one within 

 the other and united at the bottom. The outer shade has an 

 aperture at the top by which a coloured liquid can be introduced 

 into the space between the two glasses. 



270. A smaller shade similar to No. 269. 



Made by Warmbrunn, Quilitz, fy Co., Berlin. 

 E. 174. 1877. 



271. Illustrations of the system of instruction pursued 

 in the schools at Hitcham, Suffolk, under the superin- 

 tendence of the late Professor Henslow. 



Presented by the late Professor Henslow. 

 E. 97 to 100 and 101 a & b. 1857. 



These consist of notes on the lessons, figures, various apparatus, 

 with descriptions, schedules, and labels. 



B. SPECIMENS. 



272. Herbarium containing specimens of British plants 

 growing wild, and a few common trees in plantations in 

 the parish of Hitcham, Suffolk. These plants were col- 

 lected and arranged by the pupils in the schools at 

 Hitcham who had undergone Prof. Henslow's course of 

 instruction as explained in his illustrations. See No. 271. 

 In cabinet. Presented by the late Professor Henslow. 



E. 101. 1857. 



