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BOTANICAL GAZETTE 



being the case, the question mm 



linage 



t successively arising parts may vary directly with the metabolic rate, and 

 is perhaps allowable to suggest that in this case the more frequent branching 

 t the veinlets in the older leaves may be to some extent associated with a 



cence " is simply to give the former terms a new meaning. To speak of meriste- 



animal physiologist little less than a contradiction in terms. Moreover, the 

 increase in vascular tissue in the leaf with advancing age of the plant is scarcely 

 comparable to the replacement of atrophied organs by connective tissue in man 

 and the higher animals, but resembles rather the increase in stable morphologi- 

 cal structure which occurs during development in animals. Criticism of such 

 points, however, does not detract from the interest and significance of Bene- 

 dict's evidence for the occurrence of a gradual, progressive change, slight, but 

 apparently in the direction of senescence, in the meristematic tissues during 

 vegetative life— C. M. CfflLp. 



on American insect galls by Thompson. 2 In part I, the galls are classified 

 under the generic names of the host plants, with subordinate grouping based 

 on the host plant. The descriptions are very brief, in most cases restricted to 

 a single line, but give the specific names of the host plants and statements as 

 to anatomy. This first part will prove very useful to botanists. Part II 

 groups the galls with reference to the insects causing them and gives a list of 

 host plants for each. This part also includes a bibliography and a lengthy 

 supplemental list which includes a few fungus galls. The illustrations are good 

 and the entire publication will prove very helpful. 



American botanists will also be interested in a paper by Stewart 3 on the 

 anatomy of Gymnosporangium galls. This paper is summarized as follows: 



2 Thompson, M. T., An illustrated catalogue of American insect galls, pp. 66. 



