. Annals of medical history. o ri-pened from youth to manhood. The young Leonardo da Vinci as a Scientist 29 mans power of will was marxcllous indeed,to cnai)Ie him to dash away from boisterousmerrymaking to studies in mathematiesand physics, the pursuit of which requirespreeminently acalm and ec^I-lected state ofmind. AI r c a d y a tFlorence, Leo-nardo had gath-ered about hima considerablecircle of disciplesand was activenot only in fol-lowing art butalso in endeavor-ing to utilize hisknowledge o tmechanics. Notfinding in Flor-ence the desiredheld for his tal-ents, at the ageof thirty he ad-
. Annals of medical history. o ri-pened from youth to manhood. The young Leonardo da Vinci as a Scientist 29 mans power of will was marxcllous indeed,to cnai)Ie him to dash away from boisterousmerrymaking to studies in mathematiesand physics, the pursuit of which requirespreeminently acalm and ec^I-lected state ofmind. AI r c a d y a tFlorence, Leo-nardo had gath-ered about hima considerablecircle of disciplesand was activenot only in fol-lowing art butalso in endeavor-ing to utilize hisknowledge o tmechanics. Notfinding in Flor-ence the desiredheld for his tal-ents, at the ageof thirty he ad-dressed a letterto Duke Ludo-vico Moro atMilan. In thisletter he fullyexpatiates on hismanifold capa-bilities for pur-poses both ofwar—and ofpeace, mention-ing his ability: 1. To buildportable bridges,safe from fire and sword and to burn anddestroy hostile bridges. 2. To drain moats during a siege, toconstruct scaling ladders and other ap-paratus for this purpose. 3. To destroy any tower or fortificationnot Ijuilt on Statiio Eri-ctccl at Milan 4. To make light transportable cannons lor ejecting burning masses, the smoke of which would cause terror, destruction and confusion among the enemy. (Flanimen- wi-rler smoke screens.) 5. TodigsuI>terrancan tun-nels to inacces-sil)le placesnoiselessly, evenunder rivers. 6. To con-struct secureand unassailableco\ered wagonsfor invading theenemys lineswith guns andnot to be im-peded by e\erso dense a massand behindw hich the infan-try can followu n i mperiled.(Tanks.) 7. To castguns, mortarsand hurling en-gines, etc. 8. To sup-plant cannons,where these areim practicable,w ith other, untilnow unknown,p r o j e c t i n gweapons. (). To c o n -f shi|)s; linall\ if ) DA \l struct lire- and gun-procpowders and inflammables. 10. To compete, in times of peace, withany one in architecture for the erection ofpublic and private buildings and in the build-ing of canals; to execute statues in marble,bronze, and clay; execute painti
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