Botany and Zoology. 443 
Since the above was written we have learned with sorrow the death of 
Professor Henfrey. In the announcement, the editor of the Gardener’s 
Chronicle appropriately remarks, that “ Professor Henfrey has lon n 
of his friend, Dr. seo are justly celebrated for their accuracy as we 
of Botany, an e papers on Vegetable ructure now in course of pub- 
lication in the Pant a of the Royal ae Society wilt al always be 
regarded as the productions of one who was not only familiar with the 
truths of science, but able to render them attrnetive to those who are 
little accustomed to think upon such subjects.” Probably his best origi- 
nal contribution ee science was his investigation into the formation of the 
pg oo in ase 
Mareet, Jiiger, , &., and also “ai experiments made in this vicinity 
within the present year. Still, moulds will grow in paste poisoned with 
arsenic, and e insects will feed upon animal matter impregnated with 
rite without apparent injury.* Notwithstanding these known excep- 
onal cases, however, the following statements, condensed from the Gar- 
Jena Chronic: pt. 10, are startling, not only in a physiological 
point of view, but ee ae if confirmed, they mu tents all medico-legal 
evidence in cases ted ni vy, Professor 
uspected poisoning. 
of Agriculture and " Aggeioedeceed Cheeriatry' in the Royal Dublin Society, 
knowing that sulphuric acid containing arsenic was largely employed in 
making superphosphate and other artificial manures, and that these must 
when ted to their roots in the soil, Dr. Davy transplanted into a 
fewer sat ‘lindo small plants of peas, and when they were established, he 
commenced watering them every —_ or third day with a saturated 
aqueous solution of arsemio ous acid ; this treatment was continued for 
riod avy W, 
some months; on ie soa he found that these plants had grown up to 
their full size, ” had flowered and: fruited:- On marcel ise mination he 
detected arsenic in them, both in the herbage an nope Hav- 
ing thus learned “ that arsenic ay ae — up in comida — 
ti | . servi _ ora : 
ty by plants without destroying oor aster ome 
xisted in di efile manures (such as the 
* See this vol., p. 166. 
