DOMESTIC GBEENH.O TT *ES. 
91 
CHAPTER IX. 
DOMESTIC GREENHOUSES.' 
^EFORE entering on a description of this apparatus, the 
circumstances under which it was discovered may be 
briefly adverted to. Mr. Ward, the gentleman to whom 
we are indebted lor the discovery, is a surgeon, residing in Well- 
close Square, London. From his earliest youth Mr. Ward has 
been attached to botanical pursuits ; but living in a densely popu¬ 
lated neighborhood, surrounded with manufactories, and enve¬ 
loped in the smoke of London in its very worst form, he had been 
compelled to give up the cultivation of plants, until the following 
simple incident seemed to point out a mode by which he could 
follow his favorite amusement with some degree of success. He 
had buried the chrysalis of a sphinx in some moist mould, which 
was inclosed in a glass bottle covered with a top. In watching 
the bottle from day to day, he observed that when exposed to 
the warmth of the sun the moisture rose from the mould, and 
became condensed on the inner surface of the glass, and again 
fell back upon the mould during the night, thus keeping up a 
continual moisture in the atmosphere within the glass ; he also ob¬ 
served about a week prior to the final change of the insect, a 
seedling fern and grass appear on the surface of the mould. 
A-fter having secured the insect, Mr. Ward set himsejf to observe 
* The materials for this paper are chiefly from Chambers’s Edinburgh 
Journal, with some slight additions from Mr. Ellis’s paper read to the Bo¬ 
tanical Society of Edinburgh. 
