564 EEVIEW. 



uabranched, and the three nuclei should have been shown as 

 they are represented in the diagram, but not the outlines of 

 the smaller cells : nor should I have spoken of two cells as 

 lying within the third, I still believe that we have three cells 

 fused together, but we have as yet no evidence as to their 

 relation to one another. 



M. Bolsius makes a great deal of his discovery of the fact 

 that many of the " cells" in Clepsine are joined to one another 

 by three prolongations, each of which gives passage to a duct. 

 I have never seen (nor apparently has Schultze) in teased 

 preparations anything like M. Bolsius' fig. 8 (3), although I 

 have had eight or ten of the " cells" in question in contact with 

 one another. I have less hesitation in denying the correct- 

 ness of M. Bolsius' view since he has given drawings (fig. 7, 

 A — M, 3) of the successive sections from which he has con- 

 structed his diagram and his theory. I maintain that the 

 reconstruction of the sections figured does not give the dia- 

 gram obtained by M. Bolsius, and I imagine that he has 

 overlooked the further course of the ductules figured as separate 

 in c and d. Nor is M. Bolsius any nearer the truth with 

 regard to the organ in Nephelis, as he could, I think, easily 

 convince himself if he would examine the whole organ dissected 

 out fresh or in young living specimens, or in teased pre- 

 parations. 



It is unnecessary for me to enter into further detail. 

 I may, however, remark again, in conclusion, that M. 

 Bolsius' astounding misconception of the anatomy of these 

 organs is due to his abuse of a method. Every one who 

 has studied such organs, both by means of serial sections 

 and whole or teased preparations of fresh or preserved 

 material, must have come to the conclusion that there 

 are many cases where the sections admit of various in- 

 terpretations, or are even, taken by themselves, positively 

 misleading. M. Bolsius states, it is true, that he has used 

 other methods to control the interpretation of his sections, 

 but from his statements quoted above, and from the 

 anatomical results that he has obtained, I feel sure that his 



