HOOKE 145 



He attributes the drooping of the leaves or leaflets either 

 to the circulation of a liquid, or to "a constant pressing 

 of the subtiler parts of it to every extremity of the 

 plant." This is a conjectural anticipation of what is 

 now called turgidity, which has been experimentally 

 demonstrated to be a cause of change of figure in plant- 

 tissues.^ 



MAECELLO MALPIGHI 

 1628-1694 



Marcelli Malpighii Opera omnia. 2 vols. Fol. Lend. 1686-7. Opera 

 posthuma, quibus preefixa est ejusdem vita a seipso scripta. Fol. Lond. 

 1697. 



The above are often found collected in one or two 

 volumes. They were reprinted without editing, and the 

 pagination is not continuous, so that reference is trouble- 

 some. 



Several of the treatises were published separately 

 during Malpighi's lifetime. The following are of 

 special interest to the naturalist : — De Bombyce. 4 to. 

 Lond. 1669. De Ovo incuhato, Ato. Lond. 1672. De 

 formatione pulli in ovo. 4to. Lond. 1673. Anatome 

 Plantarum, 2 ipts. Fol. Lond. 1675-9. A preliminary 

 sketch (Anatomes Plantarum Idea), transmitted to the 

 Royal Society in 1671, is prefixed to the last-named. 



Malpighi was born near Bologna, and studied philo- 

 sophy at the neighbouring university,^ until the death 

 of both his parents threw upon him the care of a family 

 of eight brothers and sisters. He had to arrange for 



^ See the discussion of Briicke's treatise on the leaf-movements of Mimosa 

 (1848) in Sachs' History of Botany, English trans, pp. 657-8. 



'^ Bologna has done what it can to show its pride in Malpighi. In the upper 

 arcade of the quadrangle of the old university an allegorical fresco has been 

 painted in his honour. There is a Piazza Malpighi and also (but suoh monu* 

 ments are fugitive) a Birraris Malpighi. 



K 



