1899] BRYOZOA AND BIPOLARITY 7 



northern and southern hemispheres. But, whatever conclusions may 

 be drawn, the paper at least is one that does credit to the Zoological 

 Laboratory of Owens College. 



More about " Bipolarity." 



Dk. Arnold E. Ortmann of Princeton, who pointed out in 1894 that 

 the facts in regard to the distribution of Crustacea did not fit in with 

 the " Bipolarity hypothesis," has some further remarks to make on 

 the subject. He has been waiting, he says, for some definite expression 

 of results from those who have been working at the " Hamburger 

 Magelhaensischen Sammelreise," and he is disappointed. Perhaps 

 Dr. Pfeffer's lecture at the annual meeting of the German Zoological 

 Society — which he has promised to send us as soon as possible — may 

 afford further light on the problem to which we recently referred in 

 our summary of Professor D'Arcy Thompson's paper. The onus probandi 

 seems to lie with the upholders of the hypothesis, but we wish that 

 Dr. Ortmann would send us something more satisfactory than his 

 recent note (Zool. Anzeig. xxii. 1899, pp. 214-216), which makes only 

 one point, namely, that seven authors who have recently dealt with 

 the question are all on his side. It seems absurd to lose good-humour 

 on such a question, and even if Dr. Ortmann feels that he has ground 

 for irritation it is a mistake to make this apparent. The proper 

 safety-valve is an article in Natural Science. 



Natural Science in Australia. 



The Eeport of the seventh meeting of the Australasian Association for 

 the Advancement of Science is a bulky volume of 1160 pages, which 

 is full of interesting material, and affords abundant evidence of the 

 activity of scientific life in Australia. The President, Professor A. 

 Liversidge, who also edits the Eeport, dealt in his address mainly 

 with some of the recent advances in physics and chemistry. Among 

 the reports and papers more especially bearing upon natural science, 

 we may notice those on glacial boulders in Central Australia, and on 

 vernacular names of Australian birds ; Captain Hutton's address on 

 Early Life on the Earth (previously referred to in our columns) ; Dr. C. 

 J. Martin's address on the history of the relations between morphology 

 and physiology during the last fifty years ; Mr. F. Manson Bailey's 

 " few words " on the flora of the Torres Straits ; Mr. J. F. Bailey's 

 beautifully-illustrated paper on the plants of the rabbit-infested country 

 in the Bulloo Paver district ; Mr. A. J. Campbell's memoir on the 



