4月21日 星期一 （剑桥）<墨）（木）笔、玉兰将开花。

黄河回入故道至渤海，民廿七年我军在黄河入（海）口375哩处掘口使河水入淮。it京以下淮海泛滥至旧日以南575哩处，入口200000o acres 被淹，自去年三月起动工掩掘口，近已成功。

晨七点起。十点至Boylston Hall，阅郭、谏沫若《甲骨文研究》机O 中膳（后）至Instit阳ut忧e of Geogra阱ph旧al Ex叩pl阳0创r硝at甜10n与Brooks 谈，知美国气象学会定于本月廿八日起在华盛顿开会四天。余以本月卅号须看牙医，必须在剑桥，故华盛顿不能前往矣。关于宝堃因明年能否留此尚未可必，故目前不能决定行止如何。他的意见，如能晨期，想留剑桥至明年春天。五点至游泳池游泳，六点回。

七点偕Iris与学铺二人赴Boston，至R.H.White 购得Electric Ice Box 电冰箱一只，六立方英尺， General Electric 制，价为179。75，一星期内交货，余即购置。回至Commander Hotel443号（晤）梁庆椿，渠于去年十月来此，在Intemal monetaIγFund 国内货币基金组织，据云Inte口lat10nal Bank 系长期放款，而IntemaI monetaryFund 则短期放款云。渠以为目前中国财政情况较佳。十点回0元任来谈，欲余学担5习语言十五小时，余甚愿受教也。睡时已一点半矣。

Dialectical materialism辩证唯物主义.Bertrand Russell 罗素， A Hisωry0/ WestemPhilosophy < 西方哲学史》， Chap。27 ， K.marx 马克思， pp。783-84.He callshimself a materialist ， but not of the18th century sort.His so此which under Hegelianinfluence is called dialectical ， differed in important way fromtradit10nal materialism，and was akin to what is now called instrumentalism.ln marx view all sensat10n & percept10nis an interact10n of object and subject；the bare object apart fromthe activity ofthe percipient is a mere raw material which is transformed in the proc曲s of becomingknown.The quest10n whether objective truth belongs to human thinking is not a quest10nof theory ， but a practical quest10n.He says ， “The truth i.e.the reality & power ofthought must be demonstrated in practice.The contest of reality or non-reality of athought which is isolated frompractice is purely scholastic quest10n。”Philosophershave only interpreted the world in var10us ways ， but the real task is to alter it。“寄Charles H.Brown 、Richard C.Darnell 、Kendric marshall 、Z.Z.Li 函及书单次仲函