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102 MH. F. DAR^iy OK THE REL.VTIOX BETWEEN BLOOM 



work of my own in the same direction. The present paper, with 

 the exception of the introductory remarks, is written entirely 

 from my notes? of 1878. 



Through the kindness of Sir J. D. Hooker I was enabled to 

 carry out the work in the Jodrell Laboratory in the Eoyal 

 Gardens at Kew. I was thus enabled to obtain a large supply 

 of fresh material, a necessary condition to the success of my in- 

 vestigation. It is a pleasure to me to express my sincere thanks 

 for the opportunity which he so kindly phiced at my disposaL I 

 wish also to express my thanks to Mr. E. Irwin Lynch, now 

 Curator of the Cambridge Botanic Gardens, but who at that 

 time held a post at Kew. Through Mr. Lyncli's kind assistance 

 T was able to obtain good specimens of the many species which 

 I required. 



I first made a list of species of which the number of stomata 

 on the leaves have been determined, using for this purpose the 

 works of 



Czech (Botan. Zeitung, 1865). 



Kareltschikoff (BulL de la Soc. des Naturalistes de Moscou, 1866). 



Morren (Bull, de TAcademie R. de Belgique, t. xvi.). 



Weiss (Pringsheim's Jahrb. vol. iv.), 



This list I gave to Mr. Lynch, asking him to supply me with 

 specimens of species chosen at random from among those in my 

 list ; I hoped in this way to get some idea of the number of plants 

 which have bloom-protected leaves. But I was obliged to sup- 

 plement the list with leaves selected as having bloom, so that no 

 accurate conclusions of this kind can be drawn from my tables. 



own 



observations on the number of stomata. 



Having obtained my specimens, I had merely to note the dis- 

 tribution of bloom on the surface of the leaves. This is not so 

 easy as it might seem, since many leaves occur w^hich are per- 

 fectly dry after immersion, and which, nevertheless, have no true 

 bloom. In the following tables the leaves noted as having bloom 

 are such as examination with the naked eye sufficed to classify 

 among " bloom " leaves. Bloom is here used to mean a coating 

 of minute particles of a waxy character which is removable either 

 by warm water (about 40^ C.) or in any case by ether. Leaves 

 occur which emerge from water dry on the lower surface, but 

 which have no bloom in the above sense. 



