446 



denying the possibility of such transference. Our decision must 

 depend upon an unbiassed examination of the evidence which 

 can be brought forward on each side." The latter half of the 

 book is devoted to the theory and evidence, and the factors, of 

 organic evolution, and here Prof. Dendy has again shown 

 his skill, in the selection of a series of illustrative quotations, 

 and the reader is enabled to follow the development of the 

 theory of evolution in ipsissima verba of the teachers both before 

 and after Darwin. 



Most of the illustrations, of which there are nearly 200, are 

 entirely new, but a few are redrawn from original memoirs. 

 Extensive use has been made of photomicrographs ; and in this 

 connection we would again draw attention to the defects of this 

 method, as compared with a drawing made direct from the 

 micro-preparation, especially in the case of sections. The 

 photomicrograph can only represent the detail in one optical 

 plane, whereas a drawing may and often does represent details 

 from several. Such figures as those on pp. 259 and 261 will 

 convey little to the reader unless he be familiar with the 

 preparations themselves. 



The British Tunicata : An Unfinished Monograph. By the 

 late Joshua Alder and the late Albany Hancock, F.L.8., 

 edited by John Hopkinson, F.L.S., F.G.S., F.Z.S. Vol. III., 

 Aggregatae [Ascidiae Comjyositae). 8| x 5.4 in., xii + 114 

 pages, 135 figures in text, 16 plates (14 coloured) and a 

 frontispiece. London: Kay Society, 1912. Price 12s, 6^?. net. 



With the publication of this the third volume, the '* un- 

 finished monograph " of the British Tunicates is completed. 

 Canon Xorman, writing in the first volume, published in 1905, 

 gives an interesting history of the work, telling us how on the 

 death of Alder in 1867 and of Hancock in 1873 the MS. and 

 drawings were entrusted to Huxley, who undertook to prepare 

 them for publication. He, however, relinquished the task after 

 four years' delay, and it was finally undertaken by the present 

 Secretary of the Ray Society, Mr. John Hopkinson, who is to be 

 congratulated on its completion. The monograph is described 

 as "unfinished," and this is true, if only in the sense that the 

 interesting pelagic forms, such as Salpa, Pyrosoma and Appen- 



