Edingthorpe Rectory.
_Developing Chamber._--I think MR. SISSON will find some difficulty in
applying his very excellent idea of a sheet India rubber lighting medium to
his portable laboratory, as the vapour of the ether will act upon it and
render it sticky and useless after one or two usings. Allow me to suggest
what I am in the habit of using, viz. a double layer of yellow glazed
calico, stuck together with a little common drying oil, and allowed to dry
for a few days: this causes a perfect exclusion of the actinic rays, and is
very durable.