262 IN MEMORIAM : WALTER PERCY SLADEX, F.L.S., F.G.S., F.Z.S. 
to Tenby, Milford Haven, the Cumbraes, Portrush, Belfast Bay, 
Weymouth, and the Isle of Man. Some members of the little 
fraternity possessed first class microscopes, and so histology and 
micro-organisms were not neglected ; in all this delightful and 
happ\' work every month had its discovery where all was new, 
and none was more diligent, none expressed clearer ideas, none 
studied the foreign literature relative to his work more enthusi- 
astically or more profitably than Percy Sladen. 
As a boy Sladen was playfull}- dubbed by his schoolfellows 
" the Astronomer Royal ;" indeed he was always an organiser and 
a leader. For many years his motto might well have been 
" Something of everything," until he finally added to it " Every- 
thing of something." When Mr. Carruthers lectured before the 
local Literary and Philosophical Society on the microscopic 
structure of the plants of the Coal Measures, it was our friend 
who prepared sections, with the aid of an old saw and a slab 
of stone, to the required thinness, and then demonstrated their 
vegetable anatomy ; it was he who first introduced us to tlie 
graptolites and entomostraca of the Palaeozoic rocks, and explained 
the foraminifera and polycystina from deep sea dredgings ; it was 
he who, along with his intimate friend Mr. John Stubbins, 
F.R.M.S., first explained to us the niceities of microscopic 
illuminations, and taught us to prepare and mount microscopic 
objects. 
Never to be forgotten is a visit to Tenby, when for tlie first 
time the circulation in ascidians (Clavellina) was presented to our 
wondering eyes. Charmed w4th Sladen's beautiful sketches made 
on the spot, and with his description of the structures he 
demonstrated, we hung over the instrument until the early hours 
of dawn. It is probable that his observations on the abundant 
material collected at Tenby and at Milford Haven determined 
his selection of the Echinodermata as the group about which he 
determined to know everything of something. 
The star-fish, sea urchins, and ophiurids were found plentifully, 
both as to species and specimens ; m-iny interesting questions 
were raised and discussed respecting the structure and functions 
