▁account ▁of ▁labour ▁and ▁quantity ▁of ▁material ▁used , ▁cost ▁price , ▁competition , ▁law ▁of ▁supply ▁and ▁demand , ▁mon opol y , ▁mark ets , ▁sales , ▁commission , ▁management ▁of ▁coal ▁p its . ▁▁ ▁Indust rial ▁Science . ▁- Com b ust ion , ▁ev ap oration , ▁vent ilation ▁of ▁hear th s , ▁st ov es , ▁and ▁fact ories , ▁dist ill ation ▁and ▁pur ification ▁of ▁liqu ids , ▁dry ing , ▁he ating , ▁and ▁fusion ▁of ▁sol ids . ▁ ▁Indust rial ▁Organ ic ▁Chem istry .- St arch , ▁gra ins , ▁sugar , ▁fer ment ations , ▁colour ing ▁matters , ▁principles ▁of ▁the ▁art ▁of ▁d ye ing , ▁b one ▁char ▁and ▁animal ▁chem istry . ▁ ▁San it ary ▁Science .- ▁Draw ing .- Me chan ical ▁Pl ans ▁. - Sk etch es ▁of ▁various ▁parts ▁of ▁machines . ▁The ▁pup ils ▁draw ▁machines ▁suitable ▁for ▁the ▁trade ▁for ▁which ▁they ▁are ▁intended . ▁ ▁Mechan ics .- ▁Pass ive ▁Res istance .- ▁La ws ▁of ▁fr iction , ▁rub bing ▁of ▁c ords ▁and ▁bel ts ▁on ▁pul le ys , ▁fr iction ▁of ▁sp ind les , ▁stretch ing ▁of ▁c ords , ▁resistance ▁of ▁water , ▁resistance ▁of ▁air , ▁machines , ▁calculation ▁of ▁the ▁force ▁of ▁machines ▁in ▁movement , ▁we igh ing ▁machines , ▁incl ined ▁plane . ▁ ▁Res istance ▁of ▁Material s .- T ension , ▁t ors ion ,