xxxiv Proceedings. [March 21st, 1916. 



Mr. C. L. Barnes, M.A., shewed an arithmetical problem, 

 to find the missing figures in 



xxxx7x)xx7xxxxxxx(xx7xx 



X X X X X X 



X X 



X 



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7 



X 



X 







X X 



X 



X 



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x 



X 



X 







X 



7 



X 



X 



X 







X 



7 



X 



X 



X 



X 







X 



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X 



X 



X 



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X 



X 



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7 



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X X X X X X 

 X X X X X X 



The curious feature is that no figures are supplied except 

 seven 7's. There are two methods of solving the problem, 

 and two solutions are possible, viz.. divisor 125473, dividend 

 7375428413, quotient 58781 : or, divisor 125474, and the same 

 quotient, with a corresponding change in the dividend. 



The President recorded the re-occurrence of Protohydra, 

 first discovered by Greeff, in 1868, at Ostend. Professor Hickson 

 had recently received some material from the South of England 

 which, on examination, revealed the presence of many living 

 specimens of the animal. This marine form resembles the fresh- 

 water Hydra, except that it has no tentacles, and is considerably 

 smaller. The maximum length, extended, being i"8 mm., and 

 the diameter, contracted, about "12 mm. 



Professor F. E. Weiss, D.Sc, F.L.S. read a paper entitled 

 " Recent views concerning the nature of so-called 

 'Graft Hybrids'." 



Professor Weiss commenced by giving an account of the 

 earliest authentic instances of what were considered by some 

 botanists to be graft hybrids, beginning with the remarkable 

 Bizzaria orange, which was discovered in Florence in 1644, and 

 which had resulted from grafting a lemon on an orange stock. In 

 this instance the resulting graft, instead of producing lemons, 

 gave rise to branches bearing both oranges and lemons, and also 

 to some fruits which were partly orange, partly lemon. Another 



