446 Proceedings. 



Spirogyra princeps, conjugation, with oval zygospores in the cells. 



Micrasterias dt nticulata, in process of division. 



Micrasterias ampullacea, ,, ,, 



Draparnaldia glomerata, with spores emerging from the cells. 



Volvox globator, with " resting-spores " 1 1 '. stellatus, Ehr.). 



Bhodyinenia (species), with sections of coccidia and spores. 



Also a slide exhibiting Stauroneis fulmen, a rare Diatom (reported only 

 from New Zealand and Melbourne), from an extensive deposit of diato- 

 maceous earth, Waverley, near Patea. 



Exhibits. — 1. Photograph of Prismatic Solar Spectrum, 



photographed by Mr. Ives, of Philadelphia, U.S., on an Ives' 



Chlorophyl-Eosine plate. 



The negative was made with minimum exposure and forced develop- 

 ment, to show the strongest possible contrasts. The action in red and 

 orange is due solely to chlorophyl, that in yellow-green about one-third to 

 chlorophyl and two-thirds to eosine, that in dark-green chiefly to chlorophyl. 

 The visible spectrum appears strongest in deep red and weakest in blue — the 

 exact reverse of an ordinary photograph in this respect, and a result which 

 cannot be secured with any but a chlorophyl process. This was exhibited 

 by Ven. Archdeacon Stock, who received it from C. Piazzi Smyth, Astro- 

 nomer Royal of Scotland. Professor Piazzi Smyth, in sending this, remarks 

 that with this photo-material sunsets may be jDhotographed brilliantly ; and 

 peaches and oranges will come out brighter than the green leaves they are 

 amongst. 



2. The Marimba, or African piano. 



This instrument was obtained from the Zulus, but, with various modi- 

 fications, it is found in many parts of South Africa. 



Fifth Meeting : 14th September, 1887. 



Dr. Hutchinson, President, in the chair. 



New Members. — Dr. Hassell, Mr. Charles St. Barbe, and 

 Major Campbell. 



Paper*. — 1. " Remarks on a Collection made by Captain 

 Fairchild, of Rocks from the Kcrmadec Islands,'' by Sir James 

 Hector. 



The rock specimens indicate the presence of trachyte and rhyolite, and 

 also lava rocks, and with the latter are the breccias composed of large angu- 

 lar masses of a singular fibrous pumice, cemented by calcedonic quartz, the 

 matrix also containing gypsum and magnetic iron. Some of the telepathic 

 trachytes are so heavily charged with magnetic iron in tine grains as to giv( 

 the rock the gravity and appearance of a basic rock. 



2. "On a small-sized Specimen of the llapuka, Hcctorin 

 (Oligorus) gigas, Castelneau, caught in Wellington Harbour," 

 by Sir James Hector. 



I k ciiiiiiis dl this well-known New Zealand fish are rarely mel 

 with. The New Zealand fish was separated by Count Castelneau from the 

 Australian genus Oligorus, Freshwater tish known as Murray Cod, on account 

 ni tin presence of two instead of only one opercular spine. This young 

 pecimen 1 1 I in. long) proves that this peculiarity is present, in an early stage 

 of development. At the same time, the form of the young fish, it was 



