. Experimental morphology. Protoplasm; Growth. §2] EFFECT OF EXTENT OF MEDIUM ON SIZE 477 FiQ. 135. —Two individuals of Limnaea stagnalis, which have lived from May, 1891, to January, 1892, in two flasks nearly alike in respect to surface and volume of water. In the one case (shell at left) the flask, enclosing 500 cc. of air, was sealed; in the other case (shell at right) the flask remained unsealed throughout the 8 months of experimentation. (From DE Tarignt, '94.) Fig. 136. — Limnsea auri- cularis, reared in dif- ferent masses of water having the same sur- faces but different volumes. The s
. Experimental morphology. Protoplasm; Growth. §2] EFFECT OF EXTENT OF MEDIUM ON SIZE 477 FiQ. 135. —Two individuals of Limnaea stagnalis, which have lived from May, 1891, to January, 1892, in two flasks nearly alike in respect to surface and volume of water. In the one case (shell at left) the flask, enclosing 500 cc. of air, was sealed; in the other case (shell at right) the flask remained unsealed throughout the 8 months of experimentation. (From DE Tarignt, '94.) Fig. 136. — Limnsea auri- cularis, reared in dif- ferent masses of water having the same sur- faces but different volumes. The speci- mens, taken in order from left to right, were reared in vessels having surface areas of 100, 200, 400, and 500 cc. respectively. Experiments extended from 15 November to 6 April. (From de Varigny, '94.) Fig. 137. — Limnaja stag- nalis. The individual at the left lived from 18 November to 20 April in a liter of water having a sur- face of only 2 era. diam- eter ; that at the right lived during the same period in an equal vol- ume of water having a surface of 18 cm. diameter. (From db Vakignt, '94.) Fig. 138. — The Limnaea stagnalis at the left lived from 21 Novem- ber to 6 January in 1350 cc. of water hav- ing a surface of cm. diameter; that at the left, somewhat larger, lived during this pe- riod in 600 cc. of water having a surface of 16 cm. diameter. (From de Varigny, '94.) Fig. 139. — Limnsea 1 lived from 18 November to 5 April in a glass without a bottom (capacity 250 cc), suspended in the beaker (capacity 4200 cc), in which 2 lived. Limnsea 3 lived from 20 November to 7 February in a tube, suspended in a vessel in which 4 was reared. Limnsea 5 lived from 9 April to 24 June in a tube, sus- pended in the vessel in which 6 lived. (From de Vakignt, '94.). 139. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resembl
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