346 GLANDULAR HAIRS, Chap. XV. 



which minute Diptera are sometimes, though not often, caught.* 

 The cells of the glands contain bright pink fluid, charged with 

 granules or with globular masses of pinkish pulpy matter. This 

 matter must be protoplasm, for it is seen to undergo slow but 

 incessant changes of form if a gland be placed in a drop of 

 water and examined. Similar movements were observed after 

 glands had been immersed in water for 1, 3, 5, 18, and 27 hrs. 

 Even after this latter period the glands retained their bright 

 pink colour; and the protoplasm within their cells did not 

 appear to have become more aggregated. The continually 

 changing forms of the little masses of protoplasm are not due to 

 the absorption of water, as they were seen in glands kept dry. 



A flower-stem, still attached to a plant, was bent (May 29) 

 so as to remain immersed for 23 hrs. 30 m. in a strong infusion 

 of raw meat. The colour of the contents of the glands was 

 slightly changed, being now of a duller and more purple tint 

 than before. The contents also appeared more aggi-egated, for 

 the spaces between the little masses of protoplasm were wider ; 

 but this latter result did not follow in some other and similar 

 experiments. The masses seemed to change their forms more 

 rapidly than did those in water ; so that the cells had a differ- 

 ent appearance every four or five minutes. Elongated masses 

 became in the course of one or two minutes spherical; and 

 spherical ones drew themselves out and united with others. 

 Minute masses rapidly increased in size, and three distinct 

 ones were seen to unite. The movements were, in short, 

 exactly like those described in the case of Drosera. The cells 

 of the pedicels were not affected by the infusion ; nor were they 

 in the following experiment. 



Another flower-stem was placed in the same manner and for 

 the same length of time in a solution of one part of nitrate of 

 ammonia to 146 of water (or 3 grs. to 1 oz.), and the glands 

 we]-e discoloured in exactly the same manner as by the infusion 

 of raw meat. 



Another flower-stem was immersed, as before, in a solution of 

 one part of carbonate of ammonia to 109 of water. The glands, 

 after 1 hr. 30 m., were not discoloured, but after 3 hrs. 45 m. 

 most of them had become dull pui-ple, some of them blackish- 



* In the case of Saxifraga tri- stance remnants of insects ad- 



(Jactylites, Mr. Druce says (' Phar- hered to the leaves. So it is, as 



maceutical Journal,' May 1S75) I hear from a friend, with this 



that he examined some dozens of plant in Ireland, 

 plants, and in almost every in- 



