362 PEOCEEDINGS OF THE 



phyll at the exposed surface of the leaf, but the chlorophyll- 

 bearing cells are arranged inside the underground outer surfaces of 

 the leaves, except for a few on either side of the central cleft. The 

 exposed surface of the leaf consists of cells infiltrated with carbon- 

 ate of lime crystals to form a protective screen for the chlorophyll, 

 and all the light that reaches it passes through this semi-trans- 

 parent window. The rest of the plant consists of clear water-filled 

 cellular tissue. Mr. Brown said that there were about twenty 

 " windowed " plants, and that they were all natives of South 

 Africa, but that they were not all members of the genus Mesem- 

 bryanthemum. In answer to a question, Mr. Brown said that he 

 knew of no other plants that mimicked stones, but that there were 

 many that imitated other plants. The Mesembryanthemum 

 plants were so well hidden that even the ostriches, which would 

 eat anything, had failed to exterminate them. The members 

 expressed their appreciation of Mr. Brown's interesting address, 

 and of the very fine photographs of the plants in their native 

 habitat projected on the screen. 



At the 570th Ordinary Meeting of the Club, held on May 9th, 

 the President, Mr. D. J. Scourfield, F.Z.S., F.R.M.S., in the chair, 

 the minutes of the meeting held on April 11th were read and 

 confirmed. 



Mr. George S. Coverley was balloted for and duly elected a 

 member of the Club. One nomination was read for the first 

 time. 



The President announced the death of Mr. Turner, an old 

 member and a Trustee of the Club, The news was received with 

 much regret, and a vote of condolence with Mrs. Turner was 

 passed. The Hon. Secretary announced that at the next ordinary 

 meeting on June 13th Mr. E, K. Maxwell would read a paper on 

 " Some Tube-dwelling Eotifers," and Mr. F. N. Davidson would 

 give a demonstration of the " micro-telescope " and " super- 

 microscope." Dr. Hornyold very kindly sent for distribution 

 to the members some tails of elvers stained with alizarin. A 

 few drops of a saturated solution of alizarin in 90 per cent, alcohol 

 are added to 75 per cent, alcohol, and the tails are left in this 

 solution for a couple of days. Excess of stain is removed by 90 



